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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Apr. 30, 2021
Stock Issued During Period, Value, New Issues	$ 139,000	$ 106,000	$ 272,000	$ 281,000
Stock Repurchased During Period, Shares (in shares)			25,899
Stock Repurchased During Period, Value		$ 2,897,000	$ 682,000	$ 2,897,000
Stock Repurchased, Price Per Share (in dollars per share)			$ 26.35
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)					390,114
Stock Repurchase Program, Percent of Stock Outstanding					5.00%
Directors' Stock Purchase Plan [Member]
Stock Issued During Period, Shares, New Issues (in shares)			7,407
Stock Issued During Period, Value, New Issues			$ 192,000
Employee Stock Purchase Plan [Member]
Stock Issued During Period, Shares, New Issues (in shares)			4,257
Stock Issued During Period, Value, New Issues			$ 80,000

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- Definition

The percent of stock outstanding to be purchased in stock repurchase program.

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Number of new stock issued during the period.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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